Hollow section.



P. B. MOTLEY.,

HOLLOW SECTION.

AIfPLIoATIoN FILED rmm, 1911.

Patented Apr. 16, 191.2

(Adv w 1M ,C Whe ses. i ,5.7M

PHILLIPS BATHURST MOTLEY, OF WESTMOUNT, QUEBEC, CANADA, ASSIGNOR TO HIM- SELF, CHARLES NICHOLAS MONS'ARRAT, AND JOHN G. SULLIVAN, ALL OF JEST- MOUNT, census.

Specification or Letters Patent.

HOLLW SECTION Patented Apr. 16, 1912.

Application led, February 2, 1911. Serial No. 606,219.

To all whom it may concern:

Be it known that I, PHILLIPS BATHURs'r MOTLEY, a subject of the King of Great Britp ain, residing at Westmount, in the Province time serye as a conduit, and useful, particularly, in the construction of railway culverts.

The invention may be said, briefly, to coni sist of a hollow concrete or cement member monolithic in character and of triangular cross-section with sides formed to present the nature of beams andstruts.

For' Vfull comprehensionhowever .of my invention reference must be had to the accompanying drawings forming a part of this specifi-cation in which similar reference characters indicate the same parts and wherein:

Figure l. is a transverse sectional view of'a railway culvert member constructed according to my invention; Fig. 2. is a longitndinal sectional view of a portion of a culvert; Fig. 3. 1s atransverse vertical sec- Ational view of a railway embankment with my improved culvert in place; and Fig. 1l. is a vertical sectional view taken on line A B Fig. 3.

Speciically speaking the improved hollowl member consists of three equal sides o. united. by rounded corners o, each side presenting a ilat interior and convex exterior, the dat interiors and curves of the convexities, merging into the inside and outside curves, respectively, of the corners, the total exterior, in transverse section, being thus made up of easy curves, while the fiat interior surfaces present -strai lit lines leading into the curved co ers. he ends of each member are formed opresent a socket g and a spigot k corresponding therewith, in order to enable an eiective joint to be made rbetween a series of members in build-ing an integral culvert or other hollow structure of consiuleralcie length. v

., By the construction of the hollow member above described each side is of beam formation with a straight tension side and convex compression side and supported at its ends on the curved corners through which it transmits its load to the two other sides; and, owing to the straight lines presented by the fiat sided interior, these beam sides constitute diverging struts capable,

when the triangle is arranged' as shown in Fig. l, of sustaining a maximum load and transmitting it to the base the beam character of which renders it capable of carrying the load. This construction. is such therefore as to effectively resist the component forces that are dueto the passage of trains thereover the position of each side contributing to the strength of the member. This member is preferably molded in concrete and. the ytension sides of its beam sides lare reinforced by a sheet of expanded metal e within the walls and extending completely around the member with its ends overlapping as at f' and united by wiring d. The

character and with its combined beam yand strut sides is adapted to resist what have heretofore wbeen considered excessive forces and to sustain them when acting against such member from any direction; and the said member therefore advantageously meets all the requirements of a railway culvert for strength and durability and to take care of small streams close to the base of the rail level. This application of the invention is illustrated in Fig.'3 where it is subjected to and effectively sustains a considerable load and impact. The easy curves of the exterior permits the loose members to be rolled from place to place thus facilitating the work of construction of culverts or other structures ofl` considerable length.

The triangular cross-section with rounded corners of culverts constructed according to this invention has considerable utility in that the level i'loor of relative great width widens out the normal small stream and presents an unobstructed passage therefor, and the upwardly curved sidewalls formed by the rounded corners afford greater accommodation for the stream when swollen without having the disadvantageous ede'ct of damming and increasing the surface level Virhat `I claim is as follows: l. A hollow member for use as a culvert of'triangular cross section with interiorly -member thus constructed is monolithic in rounded corners and each side whereof is In testimony whereof I `have signed my straight inside and convex outside to prename to this specification in the presence ofV 3.o

Isent combined strut and beam formation. two witnesses.

2. A hollow member for use as a culvertv of triangular cross-section and the sides I )HHLIPS BATHURST MOTLEY whereof are each straight inside and-convex Witnesses: outside to present combined strut and beam NORVAL DICKSON,

formationi E. NooNAN. 

